US5642181A - Image exposure apparatus - Google Patents
Image exposure apparatus Download PDFInfo
- Publication number
- US5642181A US5642181A US08/388,509 US38850995A US5642181A US 5642181 A US5642181 A US 5642181A US 38850995 A US38850995 A US 38850995A US 5642181 A US5642181 A US 5642181A
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- US
- United States
- Prior art keywords
- scanning
- reader
- image
- mirrors
- exposure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
- G03G15/221—Machines other than electrographic copiers, e.g. electrophotographic cameras, electrostatic typewriters
- G03G15/223—Machines for handling microimages, e.g. microfilm copiers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/10—Projectors with built-in or built-on screen
- G03B21/11—Projectors with built-in or built-on screen for microfilm reading
- G03B21/118—Reader-printers
Definitions
- the present invention relates to an image exposure apparatus which is switchable between a reader state in which an image is projected on a screen for observation and a scan state in which the image is subjected to scanning exposure.
- FIGS. 11 and 12 are schematic views of an example of such reader-printer, respectively in the reader mode and in the print mode.
- a film illuminating unit is comprised of an illuminating lamp 1 and a condensing lens 2, and a desired image frame of a microfilm F is retrieved and positioned at a film illuminating position above said condensing lens 2.
- the light transmitted by the film F enters a projection lens 3 and, in the reader mode shown in FIG. 11, the light transmitted by the projection lens 3 is guided by a first reader mirror 14 and a second reader mirror 15 to the internal face of a reader screen 13, provided at the front portion of the apparatus, whereby the image information of the image frame of the microfilm, placed at the film illuminating position, is projected in magnified manner onto said screen 13 and said magnified projected image can be observed from the external side of the screen 13.
- the first reader mirror 14 of the reader system is provided at the top side of the apparatus while the second reader mirror 15 is provided at the rear side of the apparatus, so that a 4-shaped reader optical path is formed when seen from the left side of the apparatus.
- First and second scanning mirrors 5, 6 are supported by a common scanning case 100, with a predetermined mutual distance and in respectively downward positions inclined by 45° in such a manner that the extensions of the reflecting faces mutually cross perpendicularly.
- Said scanning case 100 can reciprocate in the horizontal direction, as indicated by an arrow d-b, along a guide member and under the function of drive means controlled by control means (not shown).
- the first and second reader mirrors 14, 15 and the screen 13 are positioned outside the moving path of the scanning case 100.
- said scanning case 100 is moved in the forward direction b to a right-hand end point in the apparatus and remains in a reader position (home position) at the right-hand side of the apparatus, outside the optical path (reader optical path) between the projection lens 3 and the first reader mirror 14 of the reader system, as shown in FIG. 11.
- a print mechanism 16 provided in the lower part of the apparatus is comprised, in this example, of a transfer electrophotographic copying mechanism.
- a rotating electrophotographic photosensitive drum 4 around which are provided already known image forming process means such as a charger, a developing unit, a transfer unit and a cleaning unit (said means being omitted from the illustration).
- image forming process means such as a charger, a developing unit, a transfer unit and a cleaning unit (said means being omitted from the illustration).
- a sheet cassette 10 copy sheets 9 stacked on said cassette 10, a sheet guide member 17, paired transport rollers 18, 19 and a sheet discharge tray 11.
- the control system of the apparatus When a copy button (not shown) is depressed in the reader mode shown in FIG. 11, the control system of the apparatus is switched to the print mode to activate the print mechanism 16 thereby clockwise rotating the photosensitive drum 4 with a predetermined process (peripheral) speed. Also the scanning case 100 effects a forward movement (back scan) d from the reader position to the left, with a predetermined controlled speed. As a result of said forward movement d of the scanning case 100, the first scanning mirror 5 enters and moves, as shown in FIG. 12, in the reader optical path between projection lens 3 and the first reader mirror 14 of the reader system. The second scanning mirror 16 is positioned above the photosensitive drum 4 of the print mechanism 16.
- the scanning case 100 After the forward movement d of the scanning case 100 by a predetermined distance, it is shifted to a reverse movement b to the right, and the reversing speed of said scanning case 100 is controlled at 1/2 of the peripheral speed of the photosensitive drum 4 of the print mechanism 16.
- the above-mentioned reader optical path is scanned by the first scanning mirror 5, and the scanned light is reflected by the first and second scanning mirrors 5, 6 and irradiates, as a slit, the rotary photosensitive drum 4 (image exposure), whereby the print mechanism 16 forms an enlarged print of the image information of the image frame of the microfilm F.
- the scanning case 100 continues the reverse movement b to the original reader position, whereupon the apparatus returns to the reader mode.
- the length of the reader optical path from the projection lens 4 through the first and second reader mirrors 14, 15 to the screen 13 in the reader mode is the same as that of the scanning optical path from the projection lens 3 through the first and second scanning mirrors 5, 6 to the exposed portion of the photosensitive drum 4.
- the reproduced print is obtained by the known electrophotographic process utilizing slit exposure on a photosensitive drum as explained in the foregoing example, but for responding to the recent requirements for diversified functions in such apparatus, there is often added a function of reading the image information by the use of an image pick-up device such as CCD in addition to the photosensitive drum 4.
- an image pick-up device such as CCD
- the length of the optical path from the projection lens 3 through the first and second scanning mirrors 5, 6 and the rocking mirror 101 to the photosensor array 12 is the same as that of the reader optical path in the aforementioned reader mode or that of the scanning optical path in the aforementioned print mode.
- Such optical path branching by the rocking mirror 101 allows a sharp focused image to be obtained on the photosensor array 12, as in the aforementioned reproduction printing.
- the apparatus becomes inevitably bulky because, in the reader mode, the relatively large scanning case 100 supporting the first and second scanning mirrors 5, 6 has to be retracted from the reader optical path by the rightward movement in the apparatus as shown in FIG. 11 and a large escape space has to be secured for this purpose. Also in case the function for reading the image information is provided by the photosensor array 12, the apparatus becomes bulky and expensive in cost because there are required the rocking mirror 101 for optical path branching and a driving mechanism for said rocking mirror.
- the object of the present invention is, in such apparatus as explained above, to achieve compactization of the apparatus by reducing the escape space for the scanning mirrors in the reader mode, and to enable scanning exposure on plural exposure portions with a simple structure.
- an image exposure apparatus switchable between a reader state in which an image is projected on a screen for observation and a scan state in which said image is exposed by scanning, comprising plural scanning mirrors movable integrally on a same straight line for image scanning, wherein the mutual distances of said plural scanning mirrors are varied at the switching between said reader state and said scan state.
- the present invention is featured by plural exposure portions to be selectively subjected to scanning exposure, and the mutual distance of plural scanning mirrors is different in respective scanning states for scanning exposure for respective exposure portions.
- the present invention is featured by having a first scanning case supporting at least a scanning mirror, a second scanning case supporting another scanning mirror, connecting means for connecting said first and second scanning cases, and release means for releasing said connection means, wherein the connection and release of both cases are conducted in relation to the movement of the first scanning case.
- the present invention in the reader mode, maintains the plural scanning mirrors in the reader position with the mutual distance thereof reduced from the predetermined distance in the scanning state, thereby reducing the escape space for said plural scanning mirrors and thus compactizing the apparatus.
- the mutual distance of said plural scanning mirrors is varied to the predetermined distance for the scanning state, whereby well-focused sharp exposure can be attained.
- the scanning optical system for the image reading mode can be provided by utilizing that for the print mode without employing the rocking mirror for switching the optical paths, and can attain a same optical path length as in the print mode, whereby scanning exposure can be realized on the plural exposure portions with a simple structure.
- FIG. 1 is a schematic view of the apparatus of a first embodiment in the reader mode
- FIG. 2 is a schematic view of said apparatus in the print mode
- FIG. 3 is a schematic view of said apparatus in the image reading mode
- FIG. 4 is a chart showing the variation in the speed in the forward and reverse motions of the first and second scanning cases (first and second scanning mirrors) in the image reading mode and in the print mode in succession;
- FIG. 5 is a view of the apparatus of a second embodiment, showing a state in which the first and second scanning cases are stopped in a waiting state in the reader position;
- FIG. 6 is a view showing a state in which the first scanning case is in the course of forward movement
- FIG. 7 is a view showing a state in which the first scanning case is further moved in the forward direction and is connected with the second scanning case;
- FIG. 8 is a chart showing the variation in the speed in the forward and reverse motions of the first and second scanning cases (first and second scanning mirrors);
- FIG. 9 is a chart showing, in the apparatus of a third embodiment, the variation in the speed in the forward and reverse motions of the first and second scanning cases (first and second scanning mirrors);
- FIG. 10 is a view showing the principal parts of the apparatus of the third embodiment.
- FIG. 11 is a schematic view of a conventional apparatus in the reader mode.
- FIG. 12 is a schematic view of said apparatus in the print mode.
- FIGS. 1, 2 and 3 are schematic views of an apparatus embodying the present invention, respectively in the reader mode, print mode and image reading mode by an image sensor.
- components the same as those in the aforementioned apparatus shown in FIGS. 11 and 12 are represented by same numbers and will not be explained further.
- the first and second scanning mirrors 5, 6 are respectively fixed on separate first and second scanning cases 7, 8.
- the first and second scanning mirrors 5, 6 are provided in mutually opposed downward positions, respectively inclined by 45° in such a manner that the extensions of the reflecting faces mutually cross perpendicularly.
- Said first and second scanning cases 7, 8 are driven on a same straight line along an unrepresented lateral guide member, in the forward and reverse directions as indicated by arrows d and b, independently by unrepresented drive means.
- the first and second reader mirrors 14, 15 and the screen 13 are provided outside the moving path of the first and second scanning cases 7, 8.
- the first and second scanning cases 7, 8 are shifted to the right-hand position in the apparatus by respective drive means and are stopped in the illustrated reader position, with the mutual distance between the first and second scanning mirrors 5, 6 being shortened as indicated by e, whereby said scanning mirrors are retracted from the reader optical path between the projection lens 3 and the first reader mirror 14 of the reader system.
- the reader optical path stays open and, as in the state shown in FIG. 1, the image information of an image frame of the microfilm, placed at the film illuminating position, is projected in magnified manner on the reader screen 13 constituting a first exposure portion.
- the control system of the apparatus When the copy button is depressed in the reader mode shown in FIG. 1, the control system of the apparatus is switched to the print mode, whereby the print mechanism 16 is activated. Also the first and second scanning cases 7, 8 effect forward movement d to the left with predetermined speeds by respective drive means controlled by the control means, and the distance of said first and second scanning mirrors 5, 6 is spread to a predetermined distance a for the print mode.
- the forward movement d of the first scanning case 7 the first scanning mirror 5 enters the reader optical path, while by the forward movement d of the second scanning case 8, the second scanning mirror 6 becomes positioned above the photosensitive drum 4 of the print mechanism 16.
- the length of the scanning optical path (printer optical path) from the projection lens 3, through the first and second scanning mirrors 5, 6, to the exposure portion of the photosensitive drum 4, constituting a second exposure portion becomes equal to the length of the reader optical path, in the reader mode, from the projection lens 3 through the first and second reader mirrors 14, 15 to the screen 13.
- the first and second scanning cases 7, 8 effect a reverse movement to the right with a same speed, thus maintaining said distance a therebetween.
- the reader optical path is scanned by the first scanning mirror 5, and thus scanned light is reflected by the first and second scanning mirrors 5, 6 and is focused as a slit on the photosensitive drum 4 constituting the second exposure portion, whereby the print mechanism 16 executes magnified printing of the image information of the image frame of the microfilm F.
- the first and second scanning cases 7, 8 continue the reverse movement b to the right and, after the second scanning case 8 returns to the original reader position, the first scanning case 7 continues said reverse movement b thereby reducing the distance to the second scanning case 8, until the original reader position where the distance to the second scanning case 8 is reduced to e, whereupon said reverse movement is terminated to restore the state shown in FIG. 1 and the apparatus returns to the reader mode.
- the image sensor 12 is fixed, with the light-receiving face thereof upwards, in the vicinity of the photosensitive drum 4, but the rocking mirror 101 for switching the optical paths, as shown in FIGS. 11 and 12, is not provided.
- the first scanning case 7 effects a forward movement d to the left to enter the reader optical path, thereby switching the reader optical path to the print optical path.
- the second scanning case 8 When the distance of the first and second scanning mirrors 5, 6 is widened to a predetermined distance c ( ⁇ a) for the image reading mode, the second scanning case 8 effects the same forward movement d with a speed as that of the first scanning case 7, thereby maintaining said distance c thereto. In this state a scanning operation is executed on the image sensor 12 constituting a third exposure portion. More specifically, the reader optical path is scanned by the first scanning mirror 5, and thus scanned light is reflected by the first and second scanning mirrors 5, 6 and is focused as a slit on the light-receiving face of the image sensor 12 constituting the third exposure portion, whereby the image information of the image frame of the microfilm F is photoelectrically read and processed.
- the image sensor 12 is provided, with the light-receiving face thereof upwards, at a position displaced from the exposure portion of the photosensitive drum 4 by a distance (c-a) to the right and by a distance (c-a) above said photosensitive drum 4.
- FIG. 4 show the variation in the speeds of the first and second scanning cases 7, 8 (first and second scanning mirrors 5, 6) in such continuous operation, wherein the abscissa indicates the elapsed time while the ordinate indicates the speed, taken as positive or negative respectively in the forward (leftward) movement d and reverse (rightward) movement b, and a broken line and a solid line respectively indicate the speeds of the first and second scanning cases 7, 8.
- the first and second scanning cases 7,8 are retracted from the reader optical path and are stopped in the reader position at the right-hand side of the apparatus, at first the first scanning case 7 effects a forward movement d to the left, thus entering the reader optical path and switching the reader optical path to the print optical path. Then, when the distance of the first and second scanning mirrors 5, 6 is extended to c (FIG. 3) at a time g, the second scanning case starts a forward movement d to the left with a speed the same as that of the first scanning case 7.
- the scanning exposure is executed on the image sensor 12 constituting the third exposure portion (from g to h).
- the first scanning case 7 stops at first (time h) and waits.
- the second scanning case 8 is reversed and starts a reverse movement b to the right (time i).
- the first scanning case 7 also starts a reverse movement b to the right with a speed the same as that of the second scanning case 8.
- scanning exposure is executed on the photosensitive drum 4 constituting the second exposure portion.
- image processing means such as image density control means, black frame erasing means and image rotating means, thereby obtaining a desired reproduced print from the photosensitive drum 4.
- the second scanning case stops at first (time j), and then the first scanning case 7 also stops (time k) when the distance between the first and second scanning mirrors 5, 6 is reduced to e, whereupon the light is projected on the screen 13 constituting the first exposure portion and the apparatus returns to the reader mode.
- the image information obtained by the image sensor 12 is utilized as data for image processing in the reproduced printing from the photosensitive drum 4, but such image information may be recorded in a memory such as a magnetooptical disk or transmitted to an external equipment such as a laser beam printer.
- the first and second scanning mirrors 5, 6 are maintained in the reader position as shown in FIG. 1, with a mutual distance e smaller than the distance a in the print mode shown in FIG. 2 or the distance c in the reading mode shown in FIG. 3, whereby the escape space for said scanning mirrors 5, 6 can be reduced in the reader mode and the compactization of the apparatus can be achieved.
- the scanning optical system for the reading mode utilizing that in the print mode but without employing the rocking mirror 101, shown in FIGS. 11 and 12, for optical path switching, and with a same optical path length as in the print mode, whereby scanning exposure can be realized on plural exposure portions (photosensitive drum 4 and image sensor 12) with a simple structure.
- FIGS. 5 to 8 illustrate a second embodiment of the present invention, wherein the image-bearing light emerging from the projection lens 3 is selectively focused on two exposure portions, i.e. the screen 13 and the photosensitive drum 4.
- FIG. 5 shows the state in the reader mode, in which the first and second scanning mirrors 5, 6 are stopped, with the mutual distance thereof reduced to e, at the reader position at the right-hand side of the apparatus.
- First and second scanning cases 7', (8', respectively supporting the first and second scanning mirrors 5, 6, are rendered capable of reciprocating motion in the lateral direction, along a horizontally extending guide rail 20.
- the first and second scanning cases 7', 8' are respectively U-shaped in the vicinity of the mounting portions to the guide rail 20, respectively by an upward notch and a downward notch, and are mounted in mutually staggered manner on the guide rail 20.
- a photosensor 28 which is interrupted, in the reader mode, by a position detecting plate 29 mounted on the first scanning case 7'.
- Said first scanning case 7' is reciprocated by a driving wire 30, connected to drive means (not shown).
- the first scanning case 7' effects the forward movement to the left by the driving wire 30.
- the roller 25 rolls on the cam member 27, and the connecting arm 22 moves to the left while maintaining its angular position.
- the connecting arm 22 impinges on a connecting shaft 31 protruding in the left-hand portion of the second scanning case 8', as shown in FIG. 6.
- the connecting shaft 31 comes into contact with a cylindrical surface 22a having the center at the rotary axis 21 of the connecting arm 22, whereby the first scanning case 7' pulls the second scanning case 8' while the roller 25 turns on the slanted face of the cam member 27 whereupon the connecting arm 22 effects rotation to complete the connection.
- the roller 25 may start to turn on the slanted face of the cam 27, so that the connecting arm 22 may start rotation, prior to the collision.
- a face 22b of the connecting arm 22 rides on the connecting shaft 31, thereby suspending the rotation of the connecting arm 22.
- the face 22b of the connecting arm 22 slides on the connecting shaft 31, and, when the fitting portion is reached, the connecting arm effects rotation to complete the connection. Thereafter the first scanning case 7' starts to pull the second scanning case 8'.
- the first and second scanning cases 7', 8' thus connected, further move to the left by the driving wire 30.
- the photosensor positioned at the left and the position detecting plate 29, that the first and second scanning cases 7', 8' reach a scanning start position for the photosensitive drum 4 the first and second scanning cases 7', 8' still in the connected state are reversed and start a reverse movement b to the right, thereby effecting scanning exposure to the photosensitive drum 4 in the same manner as in the print mode (FIG. 2) in the aforementioned first embodiment, for providing a reproduction print.
- the first and second scanning cases 7', 8' continue the movement to the right, and they are disengaged through operations inverse to those in the forward movement (in the order of FIGS. 7, 6 and 5). More specifically, the roller 25 rolls up the slanted face of the cam member 27 as shown in FIG. 7, whereby the connecting arm 22 rotates clockwise and is disengaged from the connecting shaft 31 (FIG. 6). At this point the second scanning case 8' stops while the first scanning case 7' alone continues to move to the right and, when the photosensor 28 is interrupted by the position detecting plate 29, the first scanning case 7' is also stopped whereby the reader mode state is restored (FIG. 5).
- FIG. 8 shows the variation in the speeds of the first and second scanning cases 7', 8' in the course of the printing operation, as in the first embodiment.
- the speed of the first scanning case 7' is lowered in a period around the collision in the forward movement, by detecting a period from l to m with the photosensor. Then the scanning operation on the photosensitive drum 4 is executed in a period from n to o, and the reader mode state is restored from a time p.
- the detections of the scanning start position and of the period l-m may be achieved for example with an encoder.
- FIGS. 9 and 10 show a third embodiment of the present invention.
- the colliding face 22d of the connecting arm 22 is formed as a cylindrical surface having the center at the rotary axis 21 of the connecting arm 22, but it may also be formed, as shown in FIG. 10, as a slanted curved surface 22c.
- the variation in the speeds of the first and second scanning cases 7', 8' in this case is shown in FIG. 9.
- the second scanning case 8' represented by the solid line
- the first scanning case 7' represented by the broken line
- the escape space for plural scanning mirrors can be reduced in said reader state whereby the entire apparatus can be compactized, and scanning exposure can be made on plural exposure portions with a simple configuration.
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Abstract
Description
Claims (21)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6-039291 | 1994-02-15 | ||
JP6039291A JP2630247B2 (en) | 1994-02-15 | 1994-02-15 | Image exposure equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
US5642181A true US5642181A (en) | 1997-06-24 |
Family
ID=12549056
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/388,509 Expired - Fee Related US5642181A (en) | 1994-02-15 | 1995-02-14 | Image exposure apparatus |
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US (1) | US5642181A (en) |
JP (1) | JP2630247B2 (en) |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US488605A (en) * | 1892-12-20 | Gate-operating device for elevators | ||
US4589767A (en) * | 1982-04-22 | 1986-05-20 | Canon Kabushiki Kaisha | Reader-printer |
US4751553A (en) * | 1986-07-07 | 1988-06-14 | Canon Kabushiki Kaisha | Reader-printer |
US4864359A (en) * | 1987-03-10 | 1989-09-05 | Teiichi Yamasaki | Scanning exposure device |
US4947213A (en) * | 1985-05-16 | 1990-08-07 | Canon Kabushiki Kaisha | Projection copying apparatus |
US4958186A (en) * | 1987-05-12 | 1990-09-18 | Canon Kabushiki Kaisha | Image recording apparatus |
US5020900A (en) * | 1988-11-07 | 1991-06-04 | Canon Kabushiki Kaisha | Film feeding apparatus |
US5151593A (en) * | 1989-06-01 | 1992-09-29 | Canon Kabushiki Kaisha | Image reading apparatus with corrected optical length |
US5153697A (en) * | 1989-02-10 | 1992-10-06 | Texas Instruments Incorporated | Integrated circuit that combines multi-epitaxial power transistors with logic/analog devices, and a process to produce same |
US5365307A (en) * | 1992-04-24 | 1994-11-15 | Canon Kabushiki Kaisha | Image projecting apparatus |
US5376987A (en) * | 1992-07-28 | 1994-12-27 | Canon Kabushiki Kaisha | Space-efficient reader printer apparatus |
-
1994
- 1994-02-15 JP JP6039291A patent/JP2630247B2/en not_active Expired - Fee Related
-
1995
- 1995-02-14 US US08/388,509 patent/US5642181A/en not_active Expired - Fee Related
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US488605A (en) * | 1892-12-20 | Gate-operating device for elevators | ||
US4589767A (en) * | 1982-04-22 | 1986-05-20 | Canon Kabushiki Kaisha | Reader-printer |
US4947213A (en) * | 1985-05-16 | 1990-08-07 | Canon Kabushiki Kaisha | Projection copying apparatus |
US4751553A (en) * | 1986-07-07 | 1988-06-14 | Canon Kabushiki Kaisha | Reader-printer |
US4864359A (en) * | 1987-03-10 | 1989-09-05 | Teiichi Yamasaki | Scanning exposure device |
US4958186A (en) * | 1987-05-12 | 1990-09-18 | Canon Kabushiki Kaisha | Image recording apparatus |
US5020900A (en) * | 1988-11-07 | 1991-06-04 | Canon Kabushiki Kaisha | Film feeding apparatus |
US5153697A (en) * | 1989-02-10 | 1992-10-06 | Texas Instruments Incorporated | Integrated circuit that combines multi-epitaxial power transistors with logic/analog devices, and a process to produce same |
US5151593A (en) * | 1989-06-01 | 1992-09-29 | Canon Kabushiki Kaisha | Image reading apparatus with corrected optical length |
US5365307A (en) * | 1992-04-24 | 1994-11-15 | Canon Kabushiki Kaisha | Image projecting apparatus |
US5376987A (en) * | 1992-07-28 | 1994-12-27 | Canon Kabushiki Kaisha | Space-efficient reader printer apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPH07225432A (en) | 1995-08-22 |
JP2630247B2 (en) | 1997-07-16 |
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